Klaus Hasselmann (25 October 1931 – ) is a leading oceanographer and climate modeller. He is probably best known for developing the Hasselmann model of climate variability, where a system with a long memory (the ocean) integrates stochastic forcing, thereby transforming a white-noise signal into a red-noise one, thus explaining (without special assumptions) the ubiquitous red-noise signals seen in the climate.
Read more about Klaus Hasselmann: Professional Background and Climate Research, Fundamental Physics Research, Papers On Climate Change Modelling and Policy